Add fallback intro screen

osu.Game.Tests/Visual/Menus/TestSceneIntroFallback.cs

@@ -0,0 +1,15 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using NUnit.Framework;
+using osu.Framework.Screens;
+using osu.Game.Screens.Menu;
+
+namespace osu.Game.Tests.Visual.Menus
+{
+    [TestFixture]
+    public class TestSceneIntroFallback : IntroTestScene
+    {
+        protected override IScreen CreateScreen() => new IntroFallback();
+    }
+}

osu.Game/Configuration/IntroSequence.cs

@@ -6,6 +6,7 @@ namespace osu.Game.Configuration
     public enum IntroSequence
     {
         Circles,
+        Fallback,
         Triangles,
         Random
     }

osu.Game/Screens/Loader.cs

@@ -51,6 +51,9 @@ namespace osu.Game.Screens
                 case IntroSequence.Circles:
                     return new IntroCircles();
 
+                case IntroSequence.Fallback:
+                    return new IntroFallback();
+
                 default:
                     return new IntroTriangles();
             }

osu.Game/Screens/Menu/IntroFallback.cs

@@ -0,0 +1,56 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Audio;
+using osu.Framework.Audio.Sample;
+using osu.Framework.Screens;
+using osu.Framework.Graphics;
+
+namespace osu.Game.Screens.Menu
+{
+    public class IntroFallback : IntroScreen
+    {
+        protected override string BeatmapHash => "64E00D7022195959BFA3109D09C2E2276C8F12F486B91FCF6175583E973B48F2";
+        protected override string BeatmapFile => "welcome.osz";
+        private const double delay_step_two = 3000;
+
+        private SampleChannel welcome;
+
+        [BackgroundDependencyLoader]
+        private void load(AudioManager audio)
+        {
+            if (MenuVoice.Value)
+                welcome = audio.Samples.Get(@"welcome");
+        }
+
+        protected override void LogoArriving(OsuLogo logo, bool resuming)
+        {
+            base.LogoArriving(logo, resuming);
+
+            if (!resuming)
+            {
+                welcome?.Play();
+
+                Scheduler.AddDelayed(delegate
+                {
+                    StartTrack();
+
+                    PrepareMenuLoad();
+
+                    Scheduler.AddDelayed(LoadMenu, 0);
+                }, delay_step_two);
+
+                logo.ScaleTo(1);
+                logo.FadeIn();
+                logo.PlayIntro();
+            }
+        }
+
+        public override void OnSuspending(IScreen next)
+        {
+            this.FadeOut(300);
+            base.OnSuspending(next);
+        }
+    }
+}